rom/kernel/createcontext.c

   1 #include <aros/kernel.h>
   2 #include <aros/libcall.h>
   3
   4 #include <kernel_base.h>
   5 #include <kernel_cpu.h>
   6 #include <kernel_objects.h>
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11 #include <proto/kernel.h>
  12
  13 AROS_LH0(void *, KrnCreateContext,
  14
  15 /*  SYNOPSIS */
  16
  17 /*  LOCATION */
  18         struct KernelBase *, KernelBase, 18, Kernel)
  19
  20 /*  FUNCTION
  21         Allocate and initialize CPU context storage area.
  22
  23     INPUTS
  24         None.
  25
  26     RESULT
  27         A pointer to a CPU context storage area.
  28
  29     NOTES
  30         CPU context storage is considered private and accessible
  31         only from within supevisor mode.
  32
  33     EXAMPLE
  34
  35     BUGS
  36
  37     SEE ALSO
  38         KrnDeleteContext()
  39
  40     INTERNALS
  41
  42 ******************************************************************************/
  43 {
  44     AROS_LIBFUNC_INIT
  45
  46     struct AROSCPUContext *ctx;
  47     cpumode_t mode = goSuper();
  48
  49     /* Our context is accessible only in supervisor mode */
  50     ctx = krnAllocCPUContext();
  51
  52     /* Initialize the storage if needed */
  53 #ifdef PREPARE_INITIAL_CONTEXT
  54     if (ctx)
  55         PREPARE_INITIAL_CONTEXT(ctx);
  56 #endif
  57
  58     goBack(mode);
  59
  60     return ctx;
  61
  62     AROS_LIBFUNC_EXIT
  63 }